5667612561 has 18 divisors (see below), whose sum is σ = 8864729718. Its totient is φ = 3487760640.

The previous prime is 5667612557. The next prime is 5667612563. The reversal of 5667612561 is 1652167665.

5667612561 is a `hidden beast` number, since 5 + 6 + 6 + 76 + 12 + 561 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 720600336 + 4947012225 = 26844^2 + 70335^2 .

It is not a de Polignac number, because 5667612561 - 2² = 5667612557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5667612563) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1861600 + ... + 1864641.

Almost surely, 2^5667612561 is an apocalyptic number.

It is an amenable number.

5667612561 is a deficient number, since it is larger than the sum of its proper divisors (3197117157).

5667612561 is a wasteful number, since it uses less digits than its factorization.

5667612561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726273 (or 3726257 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 5667612561 is about 75283.5477445106. The cubic root of 5667612561 is about 1782.9262728961.

The spelling of 5667612561 in words is "five billion, six hundred sixty-seven million, six hundred twelve thousand, five hundred sixty-one".